urmusic is a free and open-source software that allows you to easily create your own music visualizer and create a music video for it!
It makes use of hardware acceleration to render frames as fast as possible.
Donations:
Support me on ko-fi: https://ko-fi.com/nasso
Spectrum3d is a software for Linux that displays the harmonics of the sound in 3D, either in real-time or from a preloaded file. It is multitouch and compatible with JACK.
It uses OpenGL, SDL, Gstreamer, Gtk+ and (optionally) libjack.
pd-codelab is a collection of abstractions, patchs and scripts for the Pure Data software made by the French community, notably around the forum http://codelab.fr